I was inspired by this film that I saw at the Star & Shadow last week. It documents the crazed experimentalism of, among others, Sun Ra, Faust, Harry Partch and a duo called No Input. The latter utilise no exterior sound sources, and instead create feedback pieces by having lots of boxes, with all the outputs of their units plugged into their inputs. Also of note was the Australian lady who composed using an orchestra of dot matrix printers.
I was at the back of the cinema, taking notes.